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I'm kind of new to the tuner life. I don't know much. Just lookin for a few things I can do to increase performance without blowing up my engine. Lol

i recently bought my msp, apparently it's had 5 previous owners and has had some minor work done to it. i happened to look under my car and i noticed the second O2 sensor is placed BEFORE the caty. my check engine light is coming on because of my second sensor. is there a reason that the o2...